| (19) |
 |
|
(11) |
EP 0 490 704 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
09.12.1992 Bulletin 1992/50 |
| (43) |
Date of publication A2: |
|
17.06.1992 Bulletin 1992/25 |
| (22) |
Date of filing: 13.12.1991 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT NL |
| (30) |
Priority: |
13.12.1990 JP 401878/90
27.03.1991 JP 63516/90
|
| (71) |
Applicant: TORAY INDUSTRIES, INC. |
|
Tokyo 103 (JP) |
|
| (72) |
Inventors: |
|
- Ito, Tatsuya
Anpachi-gun,
Gifu 503-23 (JP)
- Tsunashima, Kenji
Kyoto-shi,
Kyoto 601-13 (JP)
- Yamauchi, Hideyuki
Kusatsu-shi,
Shiga 525 (JP)
- Aoki, Seizo
Koka-gun,
Shiga 528-02 (JP)
- Kurome, Hirokazu
Otsu-shi,
Shiga 520 (JP)
|
| (74) |
Representative: Coleiro, Raymond et al |
|
MEWBURN ELLIS
York House
23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB) |
|
| |
|
| (54) |
Process for forming a polyester film |
(57) A polyester film, which is substantially non-oriented and whose main component is
polyethylene terephthalate (PET), is formed as a shaped article, for example, a package,
under conditions in which the film has no yield point. The ability of the polyester
film to form the shaped article is improved, and a shaped article having a good uniformity
in thickness can be obtained. Further, the range of temperature conditions causing
no yield point can be enlarged by laminating a PET polyester which originally tends
to have a yield point when by itself, onto a polyester having no yield point.